Are you saying that from experience... or are you just one of us who hasn't tried it yet Why because I had the same question. Need to know from someone who has tried.

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"Kisi ne sahi kaha zindagi kutti cheez hai. You live life without a care in the world not realizing that life is building a heavy load of trash that it dumps on you one fine day, breaking your back." - saneless

There used to be a company during the dot com era... Their business plan was, they get paid based on number of clicks or something like that. They did get bought out for 3bill or so later and google is their parent company now (Their business plan has changed significantly since though).. There were others like fastclick, valueclick and some others in similar vein.

Technology is cookie based web browsing habits tracking etc and that put them in some legal trouble of being spyware and such.. don't remember much about that. Google devetaa might help.